DATA: ls_employee_entity TYPE zapp_table.

    SELECT * FROM zapp_table INTO TABLE @DATA(lt_table_empl).
    LOOP AT lt_table_empl ASSIGNING FIELD-SYMBOL(<fs_empl>).
      MOVE-CORRESPONDING <fs_empl> TO ls_employee_entity.
      INSERT ls_employee_entity INTO  TABLE et_entityset.
    ENDLOOP.